KR101977013B1 - How to place a water lead-through module on the water lead-through module and the hull of the ship - Google Patents

Abstract

The present invention relates to a water leadthrough module (10) for discharging water to the sea through a ship's hull (12), said module comprising a flow tube having a first end (14.1) and a second end (14.2) The flow tube 14 is made of a first grade steel and has an attachment flange portion 18 at the first end of the flow tube 14 and an outer peripheral portion 20 ' And an outlet flange portion 20 at a second end of the flow tube 14 extending radially outward from the second end, the module comprising a flat transition plate 22 of a second grade steel having an outer periphery 22 ' And the inner circumferential portion 22 " of the transition plate 22 includes an outer circumferential portion 22 " of the outlet flange portion 20 and an inner circumferential portion 22 " 20 ', and the transition plate 22 is coaxially aligned with the outlet flange portion 20 of the flow tube 14 in the axial direction Chi is also firmly connected by welding to the outlet flange.

Description

How to place a water lead-through module on the water lead-through module and the hull of the ship

The present invention relates to a water lead-through module according to the preamble of claim 1. The present invention also relates to a method for placing a water lead-through in the hull of a ship.

Scrubber units for scrubbing exhaust gases from internal combustion piston engines have been used to some extent in ships. In such a scrubber, the exhaust gas is directed into a scrubber unit, where a scrubbing medium, such as an alkaline cleaning solution, is sprayed into the exhaust gas, whereby the alkali component reacts with the acid component of the exhaust gas. The scrubbing medium is sometimes supplied from a so-called process tank. The scrubbing medium absorbs SO ₂ , heat and other components from the exhaust gas flow. For example, due to stricter environmental regulations, so-called two-stage or multi-stage scrubber units have been developed. In this scrubber unit, the scrubbing medium is sprayed into the exhaust gas flow in two or several stages.

As an example of such a scrubber, reference is made to document WO 2007/045721 A1. WO 2007/045721 A1 discloses a method and apparatus for the treatment of exhaust gases from a large supercharged internal combustion engine, particularly a diesel engine, in a system, wherein the exhaust gas from the engine is directed to an exhaust gas scrubber, do. The exhaust gas is cooled in the exhaust gas scrubber to condense water vapor in the exhaust gas and recover clean water, and the recovered water is supplied to the inlet air of the engine. In an exhaust gas scrubber, the cooling of the exhaust gas is achieved in at least two stages, a cleaning stage and a cooling stage, which are continuously arranged. WO 2007/045721 A1 proposes that sea water may be advantageously used as cooling liquid in a heat exchanger and similarly as wash water if the engine has a system arranged on a boat or other structure located in the water.

WO2012113977 A1 discloses a scrubber system for treating exhaust gas in a ship with a water-based solution comprising a first scrubber unit and a second scrubber unit, an exhaust gas inlet of the first scrubber unit and an exhaust gas outlet of the second scrubber unit, And a second conduit section connecting the first scrubber unit to the second scrubber unit, a first scrubbing medium circuit and a second scrubbing medium circuit. The first scrubber medium circuit is provided with a scrubbing solution source having a first connection from the ship below the water line to the outside of the ship's hull and the second scrubber medium circuit is provided with a source of scrubbing solution having a fresh water source of the ship do.

In offshore installations, the scrubbing medium may be fresh water or seawater, i.e., water on which the vessel is floating. When fresh water is used, it is generally recirculated so that this fresh water can be reused and a portion of the recirculated fresh water, so-called bleed-off, is converted from the main stream and is directed to a treatment plant for cleaning, And is discharged from the ship. The water used is replenished by a certain amount of fresh topping-up fresh water. In the case of seawater, all used water is generally directed to the treatment plant and is generally discharged from the ship without any recirculation.

The amount of seawater flow required to achieve adequate scrubbing effects on the ship is significant and the seawater may be somewhat corrosive and thus the discharge of seawater from the ship through the hull is problematic.

It is an object of the present invention to provide a water leadthrough module for discharging exhaust scrubbing water through the hull of a ship to the sea with significantly improved corrosion resistance and safe operation compared to prior art solutions.

The object of the present invention can be substantially satisfied, as described in the independent claims and in other claims which describe the details of other embodiments of the invention in more detail.

According to one embodiment of the present invention, a water lead-through module for discharging water to the sea through the hull of a ship

A flow conduit having a first end and a second end, the flow conduit comprising a first grade steel,

   o an attachment flange at the first end of the flowtube for attaching the valve,

   an outlet flange portion at a second end of the flowtube, the outlet flange portion having a peripheral portion and extending radially outward from a second end of the flowtube,

Said flow tube comprising:

A transitional plate having an outer periphery and an opening defining an inner periphery of the transition plate in a plane, the inner periphery of the transition plate mating with an outer periphery of the outlet flange, Which is disposed coaxially with the outlet flange portion in the axial direction and which is tightly welded to the outlet flange portion,

.

According to one embodiment of the present invention, the first grade steel and the second grade steel are selected such that the corrosion resistance of the first grade steel is higher than the corrosion resistance of the second grade steel.

According to one embodiment of the invention, grade 1 steels are made of high alloy austenitic stainless steels as specified in EN 1.4547.

According to one embodiment of the present invention, grade 2 steels are of Grade A steel according to the DNV (Det Norske Veritas) offshore standard.

According to one embodiment of the present invention, the first grade steel is super duplex.

According to one embodiment of the present invention, grade 1 steels are high alloy austenitic stainless steels as defined in EN 1.4547 and grade two steels are Grade A steels according to the DNV (Det Norske Veritas) offshore standard.

According to one embodiment of the invention, grade 1 steels are high alloy austenitic stainless steels as specified in EN 1.4547, and grade 2 steels are super duplex.

According to one embodiment of the present invention, a seal housing extending from the wall of the flow tube to the transition plate is disposed around the flow tube.

According to one embodiment of the present invention, the flow tube includes an intermediate flange portion between the attachment flange portion and the outlet flange portion, and an annular housing extending between the intermediate flange portion and the transition plate is disposed around the flow tube.

According to one embodiment of the present invention, a leak detector is provided in the sealed housing.

According to one embodiment of the invention, the outlet flange portion extends radially outwardly of the flowtube at a distance D of at least 50% of the diameter Dt of the flowtube.

According to one embodiment of the present invention, the transition plate consists of two separate steel portions tightly coupled to one another. The two distinct parts of the transition plate are made of grade 2 steel, both being grade 2 steels. The radially inner portion is welded to the outer periphery of the exit flange portion and the second outer portion is welded to the outer periphery of the inner portion of the transition plate. The inner portion may be a duplex steel and the second portion may be a Grade A steel according to the Det Norske Veritas Offshore standard.

As a method of arranging the water lead-through in the hull of the ship,

Providing a flowtube of first grade stainless steel having a first end and a second end, wherein the flowtube is provided with an attachment flange at a first end of the flowtube, and at a second end of the flowtube, a second end of the flowtube having an outer periphery, Providing an outlet flange portion extending radially outward from the end,

Providing a flat transition plate of a second grade steel having an outer periphery and positioning an opening in the transition plate defining an inner periphery of the transition plate such that an inner periphery of the transition plate is aligned with an outer periphery of the exit flange,

Placing the transition plate in the same plane in the axial direction with the outlet flange portion of the flow tube and firmly connecting the transition plate to the outlet flange portion by welding,

- providing an opening in the hull of the ship which matches the periphery of the transfer plate and tightly connecting the transfer plate to the opening of the hull of the ship by welding

.

The exemplary embodiments of the present invention presented in this patent application should not be construed as limiting the applicability of the appended claims. The verb " includes " is used in this patent application as an open limitation that does not exclude the presence of features not mentioned. The features mentioned in the dependent claims are mutually freely combinable unless otherwise specified. The novel features considered as features of the invention are set forth with particularity in the appended claims.

In the following, the present invention will be described with reference to the accompanying schematic illustrative drawings.

1 shows a water lead-through module according to an embodiment of the present invention.
2 shows a water lead-through module according to another embodiment of the present invention.
3 shows an exhaust gas scrubber of a ship provided with a water lead-through module according to an embodiment of the present invention.

1 schematically shows a lead-through module 10 for discharging exhaust gas scrubbing water through a hull 12 of a ship to the sea. The water leadthrough module 10 is shown in Figure 1 by four different views; FIG. 1B is a side view, FIG. 1D is a rear view of the inside of the hull, and FIG. 1C is a top view. The water leadthrough module 10 is intended to serve as an immersed outlet for the scrubber water discharged from an exhaust gas scrubber installed on the ship in particular. In the following description, the water leadthrough module 10 is referred to as module 10 for simplicity.

The module 10 includes a flow tube 14 having a first end 14.1, a second end 14.2 and a longitudinal central axis 16. In order to cope with corrosive discharge water of the exhaust gas scrubber of the ship, the flow pipe is made of corrosion-resistant steel.

The flow tube 14 includes an attachment flange portion 18 at a first end 14.1 of the flow tube 14 for attaching a discharge channel and valve from the scrubber to the flow tube and a second end 14.2 of the flow tube 14, And includes an outlet flange portion (20). The outlet flange portion 20 is configured to extend radially outward from the second end 14.2 of the flow conduit 14. The outlet flange portion advantageously has a circular outer periphery. In general, the steel used in the flow tube 14 and the flange portions 18, 20 is referred to as grade 1 steel.

Preferred examples of such grade 1 steels are high alloy austenitic steels and duplex (or austenitic-ferritic) steels. Examples of high alloy austenitic stainless steels may be those defined in EN 1.4547 with a chemical composition of C 0.01 / N 0.20 / Cr 20 / Ni 18 / Mo 6.1 / other Cu in weight percent. An example of a duplex steel may be a steel as defined in EN 1.4162 with a chemical composition of C 0.03 / N 0.22 / Cr 21.5 / Ni 1.5 / Mo 0.3 / other 5 Mn Cu as weight percentages.

As an indicator of corrosion resistance, a Pitting Resistant Equivalent Number (PREN) may be used. PREN values are calculated using the following formula: PREN = 1 x% Cr + 3.3 x% Mo + 16 x% N, except in the case of stainless steels with a molybdenum content of 1.5% Is defined as the following equation: PREN = 1 占% 占 + 3 + 3.3 (% Mo + 0.5 占 W W) + 16 占 N N. The higher the PRE value, the greater the corrosion resistance of the steel. Advantageously, the formula index of grade 1 steels is greater than 40, and the formula index of grade 2 steels is less than 40.

The module 10 also includes a flat transition plate 22 having an outer periphery 22 'that includes an opening 23 defining an inner periphery 22 "of the transition plate. The inner peripheral portion 22 " of the plate mates with the outer peripheral portion 20 'of the outlet flange portion 20 so that the peripheral portions abut each other. The transition plate 22 is disposed coaxially in the axial direction with the outlet flange portion 20 and is welded firmly to the outlet flange portion 20 of the flow conduit 14. The transition plate 22 is made of normal steel equivalent to the steel used for the hull 12 of the ship.

The module 10 may be pre-manufactured in a manufacturing plant to include a flow tube 14, a mounting flange portion 18 and a transition plate 22 welded to the outlet flange portion 20 and the outlet flange portion 20. [ A hole corresponding to the outer dimension of the module 10 is formed in the hull 12 when the module is assembled to the ship's hull 12 and the module is mounted on the outer periphery 22 ' Welded to the hull. The flow conduit 14 is supported by a plurality of appropriately disposed support brackets 24 optionally utilizing a stiffener 26 attached to the hull 12.

Figure 2 schematically illustrates a water lead-through module 10 according to another embodiment of the present invention, which includes some additional features in addition to the features of the embodiment of Figure 1. The water lead-through module 10 is shown in the drawing according to four different views; Fig. 2A is a front view of the outside of the hull 12, Fig. 2B is a side view, Fig. 2D is a rear view of the inside of the hull, and Fig. 2C is a top view. As in the embodiment of FIG. 1, the water leadthrough module is intended to serve as an immersed outlet for scrubber water discharged from an exhaust gas scrubber installed in a ship in particular. In the following description, the water leadthrough module 10 is referred to as module 10 for simplicity.

The module 10 includes a flow tube 14 having a first end 14.1 and a second end 14.2 and a second end 14.1 at a first end 14.1 of the flow tube 14 for attaching a discharge channel and valve from the scrubber to the flow tube. An attachment flange portion 18 and an outlet flange portion 20 at a second end 14.2 of the flow conduit 14. The outlet flange portion 20 is configured to extend radially outward from the second end 14.2 of the flow conduit 14. The outlet flange has an outer circumference that is advantageously circular.

The module 10 also includes a flat transition plate 22 having an outer periphery 22 'that includes an opening 23 defining an inner periphery 22 "of the transition plate. The inner peripheral portion 22 " of the plate mates with the outer peripheral portion 20 'of the outlet flange portion 20 so that the peripheral portions abut each other. The transition plate 22 is disposed coaxially in the axial direction with the outlet flange portion 20 and is welded firmly to the outlet flange portion 20 of the flow conduit 14.

The module further includes a sealed housing 28 annularly disposed about the flow conduit 14. The housing extends from the outer wall of the flow tube 14 to the transition plate 22 between its ends. In this way, the weld joint between the outlet flange portion 20 and the transition plate 22 is surrounded by the housing 28. 2, the flow tube includes an intermediate flange portion 21 between the attachment flange portion 18 and the outlet flange portion 20, while the housing may be of a different shape as shown by the conical dashed line 28 ' An annular housing (28) is disposed about the flow tube (14) extending between the intermediate flange portion (21) and the transition plate (22).

As shown in Figures 2c and 2d, a leak detector 30 is provided in the sealed housing. The leak detector can be practically realized, for example, as a float level measuring device, an alarm float or a pressure sensor. If the weld joint between the outlet flange portion 20 and the transition plate 22 is broken and leaks, the leakage can be detected by the increased pressure in the housing due to the water entering the housing 28. The float sensor indicates a rise in the water level of the housing.

2C, the outlet flange portion 20 extends radially outward from the flow conduit of distance D that is at least 50% of the diameter Dt of the flow conduit.

The module 10 may be pre-fabricated in a manufacturing plant to include a flow tube 14, an attachment flange portion 18 and an outlet flange portion 20 as well as a transition plate 22 and a housing 28.

The water leadthrough module 10 according to the present invention comprises a flow tube 14 of high alloy austenitic stainless steel having a first end, a second end and a longitudinal center axis (in the flow tube, An attachment flange portion 18 is provided at the end and an outlet flange portion 20 extending radially outward from the second end of the flow tube having the peripheral portion 20 'is provided at the second end of the flow tube, Providing a flat transition plate 22 having an outer periphery 22 'and providing an inner periphery 22 "of the transition plate so that the inner periphery 22" of the transition plate mates with the outer periphery 20' Is arranged in the transition plate 22 and the transition plate is disposed in the same plane as the outlet flange portion 20 of the flow tube 14 in the axial direction and the transition plate 22 is welded End on flange of exit And providing an opening to the ship's hull 12 which mates with the outer periphery 22 'of the transition plate 22 and firmly connecting the transition plate to the hull of the ship by welding.

An aperture corresponding to the peripheral dimension of the module 10 is formed in the hull 12 when the module is assembled to the ship's hull 12 in a dockyard and the module is mounted on the outer periphery 22 of the transition plate 22 ') At its periphery. The flow conduit 14 is supported by a plurality of appropriately disposed support brackets 24 optionally utilizing a stiffener 26 attached to the hull 12.

Figure 3 schematically shows a ship 100 having a hull 12. The vessel includes at least one internal combustion engine 102 provided with an exhaust gas channel 104 extending from the engine to the outside of the vessel 100. The vessel further comprises an exhaust gas scrubber (106) configured to clean the exhaust gas. The exhaust gas scrubber includes a seawater introduction system 108 configured to spray seawater into the exhaust gas stream. The exhaust gas scrubber includes a scrubber water exhaust system 110 extending from the scrubber 106 to the leadthrough 10 as depicted in either FIG. 1 or FIG. 2 at the hull 12. The lead-through 10 is below the surface 112 when the ship is at sea.

It should be noted that in the figures, the hull 12, the transition plate 22 and the tube 14 and the flange thereof are shown with different line thicknesses for illustrative purposes only.

While the present invention has been described in connection with what is presently considered to be the most preferred embodiment by way of example only, it is to be understood that the invention is not to be limited to the disclosed embodiment, but is capable of numerous modifications and variations, It is to be understood that the invention is intended to cover various other applications that fall within the scope of the invention. Details referred to in connection with any of the above embodiments may be used in connection with other embodiments if technically feasible.

Claims (9)

A water lead-through module (10) for discharging exhaust gas scrubbing water to the sea through a ship's hull (12)
- a flow tube (14) having a first end (14.1) and a second end (14.2), said flow tube (14)
an attachment flange portion (18) at said first end of said flow tube (14), and
an outlet flange portion 20 at said second end 14.2 of said flow conduit 14 having an outer periphery 20 'and extending radially outward from said second end of said flow conduit 14,
, Said flow tube (14), and
- a level 2 steel flat transition plate 22 having an outer periphery 22 'and an opening 23 defining an inner periphery 22 "of the transition plate 22, The inner circumference 22 " of the plate 22 mates with the outer circumference 20 'of the outlet flange portion 20 and the transition plate 22 is aligned with the outlet flange portion 20 of the flow conduit 14. [ (22) arranged coaxially in the axial direction and tightly connected to the outlet flange portion,
(10). ≪ / RTI > The method according to claim 1,
Wherein the first grade steel and the second grade steel are selected so that the corrosion resistance of the first grade steel is higher than the corrosion resistance of the second grade steel. The method according to claim 1,
Wherein said flow tube (14) is made of high alloy austenitic stainless steel as defined in EN 1.4547. The method according to claim 1,
Wherein said transition plate is of Grade A steel according to the Det Norske Veritas Offshore standard. The method according to claim 1,
Wherein a seal housing (28 ', 28) extending from a wall of the flow tube (14) to the transition plate (22) is disposed about the flow tube (14). The method of claim 3,
The flow tube (14) includes an intermediate flange portion (21) between the attachment flange portion (18) and the outlet flange portion (20), and the intermediate flange portion Wherein an annular housing (28) extending between the transition plates (22) is disposed. 6. The method of claim 5,
Characterized in that a leak detector (30) is provided in the sealed housing (28 ', 28). The method according to claim 1,
Wherein the outlet flange portion extends radially outwardly of the flow conduit at a distance D of at least 50% of the diameter of the flow conduit. As a method for disposing a water lead-through on the ship's hull (12)
Providing a flow tube (14) of first grade stainless steel having a first end and a second end, said flow tube (14) being provided with an attachment flange portion (18) at said first end of said flow tube (14) is provided at a second end of the flow tube (14), the outlet flange (20) extending radially outward from the second end of the flow tube (14) having an outer periphery ,
Providing a flat transition plate (22) of a second grade steel having an outer periphery and defining an inner periphery of the transition plate (22) so that an inner periphery of the transition plate (22) matches an outer periphery of the exit flange Disposing an opening in the transition plate (22)
- positioning the transition plate (22) coaxially in the axial direction with the outlet flange portion (20) of the flow tube (14) and tightly connecting the transition plate (22) to the outlet flange portion by welding, and
- providing an opening in the ship's hull (12) which mates with the outer periphery of the transfer plate (22) and firmly connecting the transfer plate (22) to the opening of the ship's hull (12)
Wherein the water lead-through is arranged on the ship's hull (12).

Images